Storage How to purchase a tiered storage tool:

Tiered storage purchase considerations

How to purchase a tiered storage tool

The practice of tiered storage has emerged as a way to mitigate this expense by keeping mission-critical data on the fastest disk platforms, while relegating less valuable data to slower and less expensive storage

Buying Guide -
The practice of tiered storage has emerged as a way to mitigate this expense by keeping mission-critical data on the fastest disk platforms, while relegating less valuable data to slower and less expensive storage, such as SATA disk or even tape.